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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26027e066168e29ab456dac9f13877b3b7169fd68890c46ba0c92a8b98be7d94' 
  AND token = 'oNWShUj5T9kmh4NIHYNx/8c95gEy6WvwNWygTZM/zx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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