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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0115116c25fdde7af742eb2f589fca20c8ad046cdf430ca9d8d88bc6a83d7c52' 
  AND token = 'hWPCxC18Y24xzzLc2ZuF6zAcW9HtrzAisBHVtNF/7EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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