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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8aabe9a6c719f4de8a72a98bed7d0716b8ec71ed3653e4b9e07439569b31d5a' 
  AND token = 'Kt8D4ZP7UUJJ0CHoxu38mVqCY5zUQYCYJnlkg5R7esw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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