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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd005a2b8248a5bc2e01858d3f75e25172a45631821db107158496b9ed1514e7b' 
  AND token = 'AXLJNl1XRHZoLDRO4db0fqluW6lsfXjnkViUwy4kfEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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