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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a9e0b3535e872da41ada91e073f1a0f92b64ccace2fd3ca585e6e62b7cf0d5' 
  AND token = '3WRtPJpHVEbtHzybvCNNPjVQJU1bKhdKf7+BhQWLejc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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