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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2893b04802cab811860989846875df84717033287a5fa7dca5962ce94bb839b0' 
  AND token = 'F5K2//pOH1RWVSZ+4XaW8Oa7B1gFTNXOgrXI1YHNBIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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