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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1b099a06c6531ed98b59f9935b2f5da2102967353feea002a1be54715a6ced' 
  AND token = 'nbPxuPqHJS1WO8pnGsjU6LWQZXQrOmkhkpx5NSkqdFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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