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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44508edda4f1297c03626d4da072f619b2e4ce06cd6594376b5d036afd1184ac' 
  AND token = 'gvu4scVY2X83RrYblam468FtutlnlHyN60I9bEwZal8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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