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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce47334b5f6aacfc8b57e05c3042483af9dc20bcc15a9b927f0052aa0e78376b' 
  AND token = 'ZVxm+d6uJ4v0ReKlbhovdGnHk/X5Om61SIPpaWLDWmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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