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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd54e01df7d9f329a3e71889c1a2883e52c4e728516cdba99cc67c37ec9415db' 
  AND token = '6YqG/5vxq2OXeVa815qcjRyjDpBqcbK+FEyEO8PYY+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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