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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9de431904743f262918ee83897d144e957d48655902a7518760424779ab21b4' 
  AND token = 'nj0alx3djP//p73LUsWAYaZtHS1BDVw7Cg1DWo1JqQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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