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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f2ac26ecce178d4e1f6917cba5256a79945f056c00c80ccb3483b1fc0f3909' 
  AND token = 'GcaLvO95gubP+hgYCCl5/Iw5SH/1+1yJ3H9dc9mhWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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