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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909e65b790ea9d8cd9bb0dd306907d716da8841dd3a4b1dc3dfa5fe5ce905bd0' 
  AND token = 'RrUSz6/X1ER+k65oSdOEwDEIRiAz40DAGHl1L+HgDJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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