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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f9608f15ed3664c158fea26ddceb6d6a115329805dab1df2b883a4c026339f' 
  AND token = 'Zmop+wM2+YCX3nzs4UFehEPZ9C5tYhc5imBc3Sk50zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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