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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc46a3e5201c09e190f517e359951d1de46dfc11399df35747e2659d3ab9b20d' 
  AND token = 'Oh2iluc0MCVvhXKAt6kLf+aMKHRU1Au6AZ3LnKL84nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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