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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b498c0110459cf7fd72bbc19be01463b8a80a741e911ed5726c0d6d9d30a1177' 
  AND token = 'VRqLkdJFSAfW0qV6Nc7F7ZtMosTFDvoaEwrMJKXo4Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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