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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1b16254ef2eba8901e4a83894c09c0c2058dbe3081b18404f57344983bff99' 
  AND token = 'gwaLzNMlUq0XhD9CrSyBoyvD9rO4xCouPUTIKi3YXPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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