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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aab1aec0ee48f8d6951636f5b1907766fdc785f141b56239952825497fe1146' 
  AND token = '7ssMp4uHtp1D0dIB2XTot3Ip5AzfLE5tRbmItGBesO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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