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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0c45f420e88f98e3f33a19f4cb2b14152c35c8330d79b1ec03cfe0eaafd8eb' 
  AND token = 'L5kmHBXmVRvwY90WDhMYvSbbls31DqavRTkgvQN0Hzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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