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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262145d49fe864b22c7917abe4d3a739dad5f7ee66b34ad888798246d969b91e' 
  AND token = 'bNKTwYc8X4kSr8w1cIzSvuQwgIIX/9tBUn6OLxnn37g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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