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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88378760584fa19dd67a50e48e2e873f7b486cd8e55b7af63f8840ce5aea1e3' 
  AND token = '9DE9mjgRDf8mkqTAaxOn1W8V2Hfz8HwayEcZsDU3QLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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