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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0443411ca48c06d9152e02dc879a0cf8dad2a7ff369c14110178d727be94db8b' 
  AND token = 'xNY88/OTjCMD8vwLzJfszlYM+Y2KNoNV96PlyJdDNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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