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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b871a4d41653e1c905f227eff6420f79c91cc15c3d628909ecaf4e66ee19e0' 
  AND token = 'bVksfHyCsuijl1a1ShYyb5Prl6c+SNzPmARrW9fts48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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