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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fa0402c04f4f6f8f179bca6cbbb793ebb9a8f96e873122eef870e7a6e3584d' 
  AND token = 'P6n0SYv40hUQNsy7q/bOSJAmG3x4QEn6Y5cPd8Tb7tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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