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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ee351d0a84d3b9cea8a074f2ab11f9978a90e86c8afb9e3d3923759ddd6971' 
  AND token = 'KtSXhBUjWyi0Fijm6IBTsSa1yr+9shLT/OBQxNkpGho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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