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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da616d8c18812cffab4dd6d24d578268db9168080e132ede7ba71292422865a' 
  AND token = 'Y72fMfV6iGo4nVE+BEJ8wuaBsqtEDp2wVKSrbSQfNL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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