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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e390951f682258515bf737f3e946a9cd1dd9406d1ebba92754c46b53d80b7078' 
  AND token = 'MpIQi3a48t5UwN7j/HEMSUS61M4X6ldj2rnK9bN5XCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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