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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68613806b10c04605682b0e0dfa08cf6b4b0c69aca24d67857803ad1c69602b' 
  AND token = 'evjc8QXJsgnuSbTKz4hTevFAcd39DHJObmbs2+0C2bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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