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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae24ed2f319f2cd9fe9a4a545d6a45fc32ce0f8b87a46b80e2d0719b8c1c99f' 
  AND token = 'N3FuBjduVWR0FsX0BJ6q+QEohQtBMidbqxm0r5oemKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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