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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbd37f1b6f53fd982377d120592fe4268b68ee5ecdb13d7b39ab23965a07b52' 
  AND token = 'iTKHrmYUBQWhrGyQD1XAoAxyIfnuiI/cySMo35GhqTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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