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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9725596497b11568fff76cb3767b769b02b2bd95ebc1f9e251c7db70c62c5f' 
  AND token = 'PauvH9DjRM/t217NdEGG7SpEqCwDm4CMjvUywoyB+08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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