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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eadbf01f776ac3fe34a6e755f946122653db262e07a4b9d34e4660bd78ffc9' 
  AND token = '5qBYuThOdrLXbsZ/eH8Q0Li8nI1f+aO3g0pz+ommCT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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