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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fac549aeebfde7848c0b7acb1041fefefea020a505e8d22842118eb524adc0b' 
  AND token = 'oLw4OhD+TTaUzqMCM7M1LJaT9qDqml800I3YJU/v3JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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