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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7210cfbee36986c16de935399711b9621cbf9f3c07673dd245823413286f7355' 
  AND token = 'rLUIqvvKSLKFkhEZc1NKri5UOFvL9XnHzMfCRwjeea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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