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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d66437bb23284a9fdfdff3708d19418b3212196e15119e2c99d602cea41ea4' 
  AND token = 'fGNODGzZXInleyyDugqji3+u8jabLVC2ZFrZxFB21Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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