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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3695293349feefdf061fec79badc74c9098ac05ad9b88a1dbf9e67b3fd6b5a' 
  AND token = 'g8LOpO1II2pvDracogVb5BSOCIQ13qyvliZ0twlaAGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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