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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326be241155f2477a257d52e399e3c7ac3019f33944d03d4df09251dd1accd10' 
  AND token = 'LheGtQSAR2mCT+xz9Idn3OMdcNRjUNIqSvA2CW4yHdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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