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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b45adce89ea71c5b61b432357fae6641c4d3e7ef526d84c7070b1eae3daa19' 
  AND token = '8/pDmk9LHY2iQJaSvmwMa7khFg2njPIptxHlEFTB7vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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