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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b75e9adba7eec8a5172e0c67deae143759ee71526a029893336f531d44afe7' 
  AND token = 'w3/9+b7UnFq/Y6UyIbfEfvPslxM41UeIM9AXWSrEnIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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