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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc48e34a82c8bcc9e7349da8c220544e2de0db0deb308e8ff2f3eff529d71e9' 
  AND token = 'JnjO9DGNV6txiS+QCYqrHk3B1Cpj52Oe80KRYjooEiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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