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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '924198596b3597795a6af0bcfdcb4d20f7f7d0b56ccaf52c9376f2ec38888e24' 
  AND token = '0TBaM+pFPU7F/dfb9ckA3uwj5XMVx0pJs4zf6Tcos68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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