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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e026915eadb3f08265fce8b0db8d16404fc2b20f49766143c1d8d0f3c0b1fffc' 
  AND token = 'KCHoWg+u0/DoOzSEBja1de5mdiEJKFbNV1/N6o/gWqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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