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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea3f6bba3bc133ca5f4f50ca9b864bc3807b6885ccbaf7f6bf16bb5663e3ac8' 
  AND token = 'BuCzqqhR7KwMHQJOnnC6a3BlMSq5/KdQlzNCOmbj/+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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