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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb5123ce062c47a43242f6b191f7929f73b05f4b7ac939a82187f047f5010a6' 
  AND token = 'QuVLITAjTf7xAJGyAGkZerpm3PPH+eF37aTdAKzxCPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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