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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9f6f85990ad28dd393de93b051ee7956f5218d3b3eef76d3ffcf127f62c1b2' 
  AND token = 'uSCb0ooIBJFob2BHt5Ey7ka031thj2ZxV1jJD4Jkt2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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