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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf9625e809b05f1b1134b10a13367bf44679a973c79dab6c57ceb3721fe0feb' 
  AND token = 'af+RgSN1Ddq62/o5yrtDfs+ez2tPaejHsO2BW+MWyP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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