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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd844a04dfcd7db04ff93eae7c2651ce2d6cdcfcc96583bf7002a622c67db92' 
  AND token = 'QLdvElfXkSTU3Y3aCiLX4nmy8oTUcoFUhk3FW1In/kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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