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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71efc8f5c1a71b0ad84f19ab8dfb598373e7932a46ebe695e68501026c4420de' 
  AND token = 'QsPw11FB9Xf0/IBIdPwAU7Q582gy80MbRJEJSAp9QDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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