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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b39f4c266ac764d4db144f5acd72711f1a4c3a1f7a4e876fb4dd9cd7d1df14' 
  AND token = 'dfCF6JXvUVjRWMdavJv0NBSmnZ2SfsvIfndlbBYzj7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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