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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c24e3077609c40c6d4a609618f2e634071dd64f1d696945d87020f4b4d4b44' 
  AND token = 'iLj0oJ13vFsHLR4Q0mW8WMkEPc23fXtEoX5fsJBU+sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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