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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037e12d5e963528443ca56da0b50356a7b40be70a764624fd36845e4a9571c48' 
  AND token = '/P94aaQ8ypadAJtKXds+ulESLOKvlviaqhZUburPJQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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