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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea232a8fc4f62c9e021e08762cd988985e6f8e0b9f49cdb35d63910ee11f9d41' 
  AND token = '3JQTuELTo9PYOmMuqA/7XN7ohkNqNWlmEOzUI4ogxgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}