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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d24e4b9cff959c4cec1e2100c8c59e5145141648040a4e713a222864eb783e' 
  AND token = 'lX9Efl5gledBte4TPDIvZgL1HQomSmEE/PlbEDKov5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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