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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2593267b8b00fcc9f579bdbc8e61fa53058c7abff61a212ff9a40617412862' 
  AND token = 'R70GJK3mxAZCHk8sDMTdwe1lSuaSotukFitCakitCqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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