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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e9f755227524faf507acbec0f6708d70a8608cd05444e47e53c60fba45ae7d' 
  AND token = 'eE6rdo8bldxw4BoVd/V7/LBuqawDvdpaADxThWBff6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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