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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb0a1888878cfa9d0328451b4cf3376b5c066659d064bfded588f98bcd7f19d' 
  AND token = 'Ifcww/xi4OpVjg6J4k7U9FkftSWvELo2FK3vJrwSzX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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