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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1051bdca3dd7d3613b98e75a8c0ef54a1eb1565bf299e320436c2f54803a99' 
  AND token = '6OQky/lA3cgpEBEnf+mid/oZ22Dkh5FJcn13nM9rAVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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