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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396260f5dae471c27d7d11c86a8a14282830c1962ef6853df6d25d553dee9cc6' 
  AND token = '9QtUpX+JaDokCA9Ecw5QPFM9/2mPDX68d5oYJLKLH9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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