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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8018b5e1192e99f14026bfd1f3113b7a60dd2445471b4151ccdb9b4c9e5d44' 
  AND token = 'IxYJ084o/2suK74gOMKQmLUAK9ptNEOn4MCkw09o6BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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