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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7a522545972bd8d6340d12c4b2dab5ba4b04def9b91cade6157a4be93d3c34' 
  AND token = 'DylkvSkpzXWam7j3O1RGSCYb/u/AGHo+Z1Cuu8h9L64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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