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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789014e544200a15314b3ca4df96ce7fb08f78f2b3b255732703ce73473e4c3c' 
  AND token = 'niBqHOgmUCxbi9KEytYv/r2qHi0Eob0Nr/dXEe7ibPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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