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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd507693005e0dd0da91fdda111d7e0ea8a3dcf8a47781b28b20b07785418d65b' 
  AND token = '9anKRW3JnWuB7RptyuDOjJRJN2fLAsfUm8o4C0VSEjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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